[. . . ] We're confident that the JBL loudspeakers you have chosen will provide every note of enjoyment that you expected ­ and that when you think about purchasing additional audio equipment for your home, car or office, you will once again choose JBL. [. . . ] It enables us to keep you posted on our latest advancements, and helps us to better understand our customers and to build products that meet their needs and expectations. Speaker Connections Connection Tips Speakers and electronics terminals have corresponding (+) and (­) terminals. It is important to connect both speakers identically: (+) on the speaker to (+) on the amplifier and (­) on the speaker to (­) on the amplifier. · If more than one pair of main speakers is being used, check the minimum impedance requirements of your receiver/amplifier. If there is low bass output, check the following: · Make sure the polarities (+ and ­) of the left and right "Speaker Inputs" are connected properly. Specifications D38 Frequency Response (­6dB): Recommended Maximum Amplifier Power*: Sensitivity @ 1 watt /1 meter: Nominal Impedance: Woofer: Midrange: Tweeter: Dimensions (H x W x D): Weight (each): 50Hz ­ 20kHz 175 watts 92dB 8 ohms 8" 4" 2" 16-3/4 x 10-3/4 x 12 inches (425 x 273 x 305mm) 17 lbs/7. 7 kg UREI 1620 40Hz ­ 20kHz 250 watts 96dB 8 ohms 15" 4" 2" 30-7/8 x 16-1/4 x 11-1/2 inches (784 x 413 x 292mm) 35 lbs/15. 9 kg *The maximum recommended amplifier power rating will ensure proper system headroom to allow for occasional peaks. We do not recommend sustained operation at these maximum power levels. Occasional refinements may be made to existing products without notice, but will always meet or exceed original specifications unless otherwise stated. Declaration of Conformity JBL Consumer Products 250 Crossways Park Drive, Woodbury, NY 11797 8500 Balboa Boulevard, Northridge, CA 91329 1-800-336-4JBL (4525) (USA only) www. jbl. com 1998 JBL, Incorporated. [. . . ] We do not recommend sustained operation at these maximum power levels. Occasional refinements may be made to existing products without notice, but will always meet or exceed original specifications unless otherwise stated. Declaration of Conformity JBL Consumer Products 250 Crossways Park Drive, Woodbury, NY 11797 8500 Balboa Boulevard, Northridge, CA 91329 1-800-336-4JBL (4525) (USA only) www. jbl. com 1998 JBL, Incorporated. [. . . ]